Code of Criminal Procedure, 1973–Sec. 439–Bail–Scope for granting–At a pre-conviction stage, there is a presumption of innocence–Detention is not supposed to be punitive or preventive–Seriousness of the allegation or the availability of the material in support thereof are not the only considerations for declining bail–Delay in commencement and conclusion of the trial is a factor to be taken into account and the accused cannot be kept in custody for an indefinite period if the trial is not likely to be concluded within a reasonable time.